HGGN□-12 AC Solid Insulated Closed Ring Main Unit

Summary

HGGN□-12 AC solid insulated enclosed ring main unit is a kind of solid insulated vacuum switchgear with full insulation, full sealing and maintenance free. The high-voltage live parts are all cast with epoxy resin materials with excellent insulation performance. The vacuum interrupter, main electric circuit and insulation support are organically combined as a whole. The functional units are connected through fully insulated solid bus.

Therefore, the whole switchgear is not affected by the external environment, which can ensure the reliability of equipment operation and the safety of operators.

The ring main unit has the characteristics of simple structure, flexible operation, reliable interlocking and convenient installation, which is suitable for 50 Hz, 12 Hz Kilovolt power system is widely used in industrial and civil cable ring network and distribution network Terminal engineering, as the acceptance and distribution of electric energy. It is especially suitable for distribution in urban residential areas, small substations, switching stations, cable branch boxes, box type substations, industrial and mining enterprises, shopping malls, airports, subways, wind power generation, stadiums, railways, tunnels and other places.

Due to the advantages of full insulation, full sealing and full shielding, the product is especially suitable for high altitude, high temperature, damp heat, severe cold, serious pollution and other areas.

Model meaning

Product classification

According to the type of switch, it can be divided into Load switch with grounding assembly (referred to as C module), load switch without grounding assembly (referred to as CB module), circuit breaker with grounding assembly (referred to as V module), circuit breaker without grounding assembly (referred to as VB module), circuit breaker contact switch (referred to as VZ module), load switch+ Fuse combination switch assembly (referred to as f module), disconnector assembly (referred to as G module).

Conditions of use

Ambient temperature: - 45 ℃ ~ + 45 ℃

Humidity: upper limit average relative humidity, daily average ≤ 95%, monthly average ≤ 90%

Altitude: ≤ 4000 m

Seismic capacity: 8 degrees

Level of protection: live body seal IP67, fuse cartridge lp67, switch cabinet shell IP3X

Functions and features

Environmental protection:

The materials used in product manufacturing are all non-toxic and harmless substances, and no toxic and harmful substances will be discharged in use. The materials can be recycled after the life cycle, which determines the environmental protection of use. All insulated, all sealed, all shielded epoxy resin switch body, fuse body (epoxy resin has excellent electrical properties, mechanical properties, thermal characteristics, used in electrical equipment for a long time, and has made good achievements. The switch cylinder and fuse cylinder are molded by epoxy resin APG process. Insulating cylinder is the key component of solid insulation switch, which is not only an insulating part but also a bearing part. It is required to meet the technical requirements of heat resistance, weather resistance, cracking resistance, high mechanical strength and good insulation strength. Because of its huge volume, many inserts and various shapes, it is difficult to manufacture the cylinder. The company has many years of experience in designing and manufacturing insulating parts, and has made great efforts to ensure the excellent mass production of the parts from barrel design, material formula and technological process. According to the user's requirements, can provide external shielding grounding can touch the cylinder

Maintenance free:

In addition to the operating mechanism, the high-voltage switch part of solid insulation indoor AC high-voltage vacuum switch cabinet is in a fully sealed state, which can avoid cleaning and maintenance and reduce the cost of operation and maintenance.

Safety:

Due to the use of shielding measures in the touchable parts, the occurrence of electric shock accidents is eliminated, and the safety of use is improved. Perfect interlocking system, three-phase isolation fracture clearly visible, avoid the occurrence of misoperation accident. The application of SF6 gas is canceled, and the explosion accident caused by the decrease of insulation performance and arc extinguishing capacity of SF6 ring main unit due to insufficient gas pressure is avoided. Strengthen phase to phase isolation structure to avoid expansion or explosion accident caused by phase to phase or multi loop short circuit. The vacuum interrupter with explosion-proof performance is adopted, and the switch sleeve has further protection performance for the switch. The auxiliary grounding switch of the load switch fuse combination is sealed in the fuse barrel with vacuum switch tube.

Easy operation:

There is only one operating handle for the disconnector grounding switch, so there is no need to identify and worry about errors. When the circuit breaker is running, the operating handle of the disconnector grounding switch can not be operated, so it is easy to operate

The working procedure is clear at a glance, as long as the personnel with a little electrician knowledge can operate, disorderly complex technical training. In this way, the operation becomes extremely simple and the operation error is eliminated.

Intelligent:

The switch cabinet is equipped with intelligent interface and sensor installation position, which can meet the requirements of smart grid.

Various operating mechanisms:

The switch can be equipped with spring and permanent magnet operating mechanism, which is convenient for users to choose.

Meet the standard

Technical conditions for 12kV solid insulated ring main unit (Q / GDW 730-2012)

GB1984 AC high voltage circuit breaker

Gb3804 3.6kv-40kv AC high voltage load switch

GB1958 "AC high voltage disConnectors and earthing switches"

GB 4208 "IP code for enclosure protection"

GB 16926 high voltage AC load switch fuse combination

GB / t15166.2 high voltage AC fuse group part 2: current limiting fuse circuit

Partial discharge measurement (GB / t7354)

GB / t11022 common technical conditions for high voltage switchgear

3.6-40.5KV AC metal enclosed switchgear and control equipment (GB3906)

Main skill parameters

Product structure and working principle

The movement structure of solid insulated ring main unit is shown in the figure

Structure characteristics of the movement of solid insulated ring main unit

Vacuum interrupter

Vacuum circuit breaker has the ability of breaking short-circuit current, which is used for overload and short-circuit protection of circuit and electrical equipment. Because of its small contact distance, short arcing time, slight burn when the contact breaks the fault current, small operation energy and fast action, it also has the advantages of small volume, light weight, small maintenance workload, fireproof, explosion-proof and low operation noise. It is an ideal circuit breaker to replace oil circuit breaker and SF6 circuit breaker, Widely used in power, metallurgy, communications and other industries such as high-frequency heating distribution system. Vacuum interrupter for circuit breaker is the key component of vacuum circuit breaker and the heart of vacuum circuit breaker. It basically determines the main performance of circuit breaker.

Solid insulation system

The current carrying conductors such as vacuum interrupter and upper and lower outlet bases are packaged into a whole by APG process. The isolating switch is installed in the cavity of the fixed pole, so that the phase to phase insulation is mainly solid insulation. The design of single phase insulated bus can avoid serious faults such as phase to phase and ground. The bus can be expanded to achieve unlimited expansion of functional units.

Three position switch

The switch cabinet is equipped with three position knife. The three position switch and the main switch are built in the fixed pole together. Three phase linkage, which can be operated to achieve three positions of work / isolation / grounding. The mechanical interlock is adopted with the main switch. Only when the main switch is in the smell position, the three position knife switch can act. In addition, the working and grounding positions of the three position mechanism can be interlocked. When the knife switch is in the working position, the grounding side hole is locked; when the knife switch is in the grounding position, the working side hole is locked.

Operating mechanism

The operating mechanism of the circuit breaker is a spring operating mechanism, which has the characteristics of simple structure, reliable action, small size, maintenance free, etc. the closing power can be adjusted up and down according to the user's requirements. The mechanism can be operated by manual energy storage, manual closing, manual separation, or electric energy storage, electric opening and closing, which is convenient for the user. The operating mechanism of the station knife switch adopts the spring design, which can quickly open and close, and has the function of breaking and closing a certain load current. In addition to manual operation, the three station mechanism can also carry out electric operation, which can realize intelligent remote control isolation and grounding, greatly facilitating the use of users.

Structural characteristics of solid insulated ring main unit

Solid insulated ring main unit is a kind of small GIS switch cabinet. Its structure is as follows

a. The High-voltage load switch and high-voltage live parts are sealed in an epoxy resin insulating sleeve shell without any gas. The vacuum arc extinguishing chamber is small in volume and reliable in arc extinguishing. The load switch is equipped with grounding switch, which has three working positions of closing, opening and grounding. The grounding knife has the function of isolating knife.

b. It can accommodate 1-5 load switch units or 1-5 circuit breaker units. Each unit is led out through three high-voltage bushing, so the cable connection is convenient.

Dimensions

Transportation and storage

The packaged ring network unit can be transported by electric forklift or crane, and the ring network unit is equipped with lifting rings for hoisting. The hoisting rope shall not be shorter than 2m.

The ring network unit should be placed in a dry, ventilated and dust-free place before installation. If covered with plastic bags, the bottom should be open for ventilation.

c. The sealing box made of import is adopted, and strict sealing measures are taken at the joint of operating mechanism and high-voltage bushing, with good performance.

d. The high-voltage bushing and high-voltage insulating cylinder are made of imported epoxy resin by APG process. The insulating cylinder and high-voltage bushing are assembled by the tight fit of silicone rubber sleeve, which has a good sealing effect.

e. Each circuit is equipped with independent operating mechanism, which is installed on the front of the cabinet and has a variety of mechanical interlocking functions

f. The load switch and grounding switch are equipped with spring operating mechanism. The load switch can be operated manually or electrically. The grounding switch not only plays the role of grounding, but also plays the role of isolation. It can only be operated manually.

g. The circuit breaker is equipped with a permanent magnetic operating mechanism, which can be electrically closed and opened, and can be manually opened and closed, but cannot be manually closed and opened. The circuit breaker can also be equipped with spring mechanism, which can be manual or electric, and the power distribution automation interface is reserved

h. There is a visual window on the panel of the ring main unit, which can directly observe the opening and closing state of the disconnector fracture. Each ring main unit is composed of three separate insulating cylinders in parallel, which is easy to install and replace. The biggest advantage is to avoid phase to phase discharge